639250752 has 224 divisors, whose sum is σ = 2033950720. Its totient is φ = 173352960.

The previous prime is 639250751. The next prime is 639250867. The reversal of 639250752 is 257052936.

It is a tau number, because it is divible by the number of its divisors (224).

It is a self number, because there is not a number n which added to its sum of digits gives 639250752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639250751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2791374 + ... + 2791602.

Almost surely, 2^639250752 is an apocalyptic number.

639250752 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639250752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016975360).

639250752 is an abundant number, since it is smaller than the sum of its proper divisors (1394699968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639250752 is a wasteful number, since it uses less digits than its factorization.

639250752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 639250752 is about 25283.4086309580. The cubic root of 639250752 is about 861.4374518024.

The spelling of 639250752 in words is "six hundred thirty-nine million, two hundred fifty thousand, seven hundred fifty-two".